Print in place coin and ring assembly. After printing, the coin should rotate within the ring.

There are two files, a loose version that can spin freely when hit, and a higher friction version that flips easily when played with, but doesn't spin freely.

2-ring version has 2 exterior rings.

FlashForge

FlashForge Creator Pro

No

No

.20 mm

I printed these at 70% infill, just because that's what my slicer was set to. I find it gives the inside piece a nice weight though, so even though this would structurally print with low infill I would still recommend a higher setting.

Here is the link to the public CAD files:
https://cad.onshape.com/documents/f38fe263bd88999beaa3cd20/w/cade1a15f8fa495802badde7/e/9c8baa1197eb422db8a0521f